Formal:
* Jak się pan/pani ma? (formal, singular, you are male/female)
* Jak się państwo mają? (formal, plural)
Informal:
* Jak się masz? (informal, singular, you are male)
* Jak się masz? (informal, singular, you are female)
* Jak się macie? (informal, plural)
You can also say:
* Co u Ciebie? (informal, singular, what's up?)
* Co u Was? (informal, plural, what's up?)
Important note:
* In Polish, you use different forms depending on the gender of the person you're talking to.
* When addressing someone formally, you use the word "pan" (male) or "pani" (female) before the verb. In plural, you use "państwo" (plural, regardless of gender).
Hope this helps!